A snubber-type magnetorheological fluid-elastomeric lag damper is developed to provide adaptive lead-lag damping augmentation for a hingeless helicopter rotor. The magnetorheological fluid-elastomeric lag damper consists of a flow valve, a flexible snubber body, and a flexible center wall separating the body into two fluid chambers. Magnetorheological fluid enclosed in the snubber body can flow through two magnetorheological valves and be activated by a magnetic field in the valves. Consistent with the loading conditions for a helicopter lag damper, the magnetorheological fluid-elastomeric damper is tested under single and dual frequency excitations. The complex modulus method was used to compare the magnetorheological fluid-elastomeric device damping performance with the baseline passive Fluidlastic damper. A significant controllable damping range is observed as current is applied to the magnetorheological valve in the magnetorheological fluid-elastomeric damper. Furthermore, to account for the nonlinear hysteresis behavior of the magnetorheological fluid-elastomeric damper and estimate the damping force, a time-domain hydromechanical model is formulated based on lumped parameters. Model parameters are established using damper geometry, material properties, and experimental data. The model is then applied to simulate the force vs displacement response and force time history under both single and dual frequency excitations.
Adaptive snubber-type magnetorheological fluid-elastomeric helicopter lag damper
AIAA Journal ; 48 , 3 ; 598-610
2010
13 Seiten, 17 Bilder, 45 Quellen
Article (Journal)
English
Adaptive Magnetorheological Snubber Lag Damper (MRSLD) for Hingeless Helicopter Main Rotor Blades
British Library Conference Proceedings | 2008
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